Q What were the two horns above Carnotaurus’s eyes most likely used for?

The most distinctive feature of Carnotaurus was the pair of thick horns above its eyes, one on each side of its head.
These horns are thought to have been too weak to serve as effective weapons. The leading theory today is that they were used for communication between members of the same species, such as attracting mates or intimidating rival males.
However, their exact purpose has not yet been fully understood.